2015-03-03T20:40:55ZApplications of numerical differentiation to computational plasticityhttp://hdl.handle.net/2117/26511
Title: Applications of numerical differentiation to computational plasticity
Authors: Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio
Description: Report del Departament de Matemàtica Aplicada III - MA0102015-02-25T13:30:29ZModeling microwave drying of soilshttp://hdl.handle.net/2117/26510
Title: Modeling microwave drying of soils
Authors: Pérez Foguet, Agustí; Huerta, Antonio
Description: Report del Departament de Matemàtica Aplicada III - MA0092015-02-25T13:23:57ZKey issues in computational geomechanicshttp://hdl.handle.net/2117/26507
Title: Key issues in computational geomechanics
Authors: Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio2015-02-25T13:12:15ZComputation of bounds for anchor problems in limit analysis and decomposition techniqueshttp://hdl.handle.net/2117/26454
Title: Computation of bounds for anchor problems in limit analysis and decomposition techniques
Authors: Muñoz Romero, José; Rabiei, Syednima; Lyamin, Andrei; Huerta, Antonio
Abstract: Numerical techniques for the computation of strict bounds in limit analyses
have been developed for more than thirty years. The efficiency of these techniques
have been substantially improved in the last ten years, and have been successfully
applied to academic problems, foundations and excavations. We here extend
the theoretical background to problems with anchors, interface conditions, and
joints. Those extensions are relevant for the analysis of retaining and anchored walls,
which we study in this work. The analysis of three-dimensional domains remains
as yet very scarce. From the computational standpoint, the memory requirements
and CPU time are exceedingly prohibitive when mesh adaptivity is employed. For
this reason, we also present here the application of decomposition techniques to
the optimisation problem of limit analysis. We discuss the performance of different
methodologies adopted in the literature for general optimisation problems, such as
primal and dual decomposition, and suggest some strategies that are suitable for the
parallelisation of large three-dimensional problems. The propo sed decomposition
techniques are tested against representative problems.2015-02-20T15:55:43ZEsquema adaptativo para problemas tridimensionales de convección-difusiónhttp://hdl.handle.net/2117/26367
Title: Esquema adaptativo para problemas tridimensionales de convección-difusión
Authors: Monforte, Lluis; Pérez Foguet, Agustí
Abstract: We present an adaptive scheme for three-dimensional convection-diffusion problems discretized by the Finite Element Method. The adaptive scheme is based on a remeshing strategy that applies a maximum volume constraint to the elements of a reference mesh. The remeshing can increase or decrease drastically the size of the elements in a single step automatically. With this strategy, the mesh quality does not deteriorate; as a consequence, the number of iterations required to solve the system of linear equations using iterative algorithms is kept constant. Two examples of very different characteristics are presented in order to analyze the proposal for a wide range of situations. The first is a three-dimensional extension of the Smolarkiewicz problem and the second is a simplified version of a point source pollutant transport problem. The results show the flexibility of the proposal. An optimal remeshing frequency, from a computational cost and accuracy of the results point of view, can be defined for both kinds of problems.2015-02-16T14:14:57ZArbitrary Lagrangian–Eulerian (ALE) formulation for hyperelastoplasticityhttp://hdl.handle.net/2117/26359
Title: Arbitrary Lagrangian–Eulerian (ALE) formulation for hyperelastoplasticity
Authors: Rodríguez Ferran, Antonio; Pérez Foguet, Agustí; Huerta, Antonio
Abstract: The arbitrary Lagrangian–Eulerian (ALE) description in non-linear solid mechanics is nowadays stan-
dard for hypoelastic–plastic models. An extension to hyperelastic–plastic models is presented here.
A fractional-step method—a common choice in ALE analysis—is employed for time-marching: every
time-step is split into a Lagrangian phase, which accounts for material e>ects, and a convection phase,
where the relative motion between the material and the ?nite element mesh is considered. In contrast to
previous ALE formulations of hyperelasticity or hyperelastoplasticity, the deformed con?guration at the
beginning of the time-step, not the initial undeformed con?guration, is chosen as the reference con?g-
uration. As a consequence, convecting variables are required in the description of the elastic response.
This is not thecasein previous formulations, whereonly theplastic responsecontains convection
terms. In exchange for the extra convective terms, however, the proposed ALE approach has a major
advantage: only the quality of the mesh in the spatial domain must be ensured by the ALE remeshing
strategy; in previous formulations, it is also necessary to keep the distortion of the mesh in the material
domain under control. Thus, the full potential of the ALE description as an adaptive technique can be
exploited here. These aspects are illustrated in detail by means of three numerical examples: a necking
test, a coining test and a powder compaction tes2015-02-16T09:40:36ZNumerical differentiation for local and global tangent operators in computational plasticityhttp://hdl.handle.net/2117/26356
Title: Numerical differentiation for local and global tangent operators in computational plasticity
Authors: Pérez Foguet, Agustí; Rodríguez Ferran, Antonio; Huerta, Antonio
Abstract: In this paper, numerical di¿erentiation is applied to integrate plastic constitutive laws and to compute the corresponding consistent
tangent operators. The derivatives of the constitutive equations are approximated by means of di¿erence schemes. These derivatives are
needed to achieve quadratic convergence in the integration at Gauss-point level and in the solution of the boundary value problem.
Numerical di¿erentiation is shown to be a simple, robust and competitive alternative to analytical derivatives. Quadratic convergence
is maintained, provided that adequate schemes and stepsizes are chosen. This point is illustrated by means of some numerical
examples.2015-02-16T09:16:20ZImplementing pro-poor policies in a decentralized context: the case of the Rural Water Supply and Sanitation Program in Tanzaniahttp://hdl.handle.net/2117/26354
Title: Implementing pro-poor policies in a decentralized context: the case of the Rural Water Supply and Sanitation Program in Tanzania
Authors: Jiménez Fernández de Palencia, Alejandro; Pérez Foguet, Agustí
Abstract: This paper examines the challenge of achieving
a balance between the implementation of centrally
designed pro-poor policies and the decentralization of
responsibilities to local governments in many African
countries. It analyzes the implementation of the Rural
Water Supply and Sanitation Program in Tanzania. Key
mechanisms for planning and allocating resources are
analyzed at ministry, district, and village levels. Results
show that a mixture of policy incoherencies, technical
shortcomings and political influence determine that only a
small proportion of funds reaches the underserved areas.
We argue that a greater connection between the bottom-up
and top-down planning mechanisms, and a sharp increase
of downwards accountability are needed before decentral-
ized decision-making result in better resources allocation.
Meanwhile a bigger intervention from central government
is needed.2015-02-16T09:06:23ZDimensionless analysis of HSDM and application to simulation of breakthrough curves of highly adsorbent porous mediahttp://hdl.handle.net/2117/26352
Title: Dimensionless analysis of HSDM and application to simulation of breakthrough curves of highly adsorbent porous media
Authors: Pérez Foguet, Agustí; Casoni Rero, Eva; Huerta, Antonio
Abstract: The homogeneous surface diffusion model (HSDM) is widely used for adsorption modeling of aqueous solutions. The Biot number is usually used to characterize model behavior. However, some limitations of this characterization have been reported recently, and the Stanton number has been proposed as a complement to be considered. In this work, a detailed dimensionless analysis of HSDM is presented and limit behaviors of the model are characterized, confirming but extending previous results. An accurate and efficient numerical solver is used for these purposes. The intraparticle diffusion equation is reduced to a system of two ordinary differential equations, the transport-reaction equation is discretized by using a discontinuous Galerkin method, and the overall system evolution is integrated with a time-marching scheme. This approach facilitates the simulation of HSDM with a wide range of dimensionless numbers and with a correct treatment of shocks, which appear with nonlinear adsorption isotherms and with large Biot numbers and small surface diffusivity modulus. The approach is applied to simulate the breakthrough curves of granular ferric hydroxide. Published experimental data is adequately simulated.2015-02-16T08:50:14ZAdaptive finite element simulation of stack pollutant emissions over complex terrainshttp://hdl.handle.net/2117/26322
Title: Adaptive finite element simulation of stack pollutant emissions over complex terrains
Authors: Oliver Serra, Albert; Montero Garcia, Gustavo; Montenegro Armas, Rafael; Rodriguez Barrera, Eduardo; Escobar Sánchez, José M.; Pérez Foguet, Agustí
Abstract: A three-dimensional finite element model for the pollutant dispersion is presented. In these environmental processes over a complex terrain, a mesh generator capable of adapting itself to the topographic characteristics is essential. The first stage of the model consists on the construction of an adaptive tetrahedral mesh of a rectangular region bounded in its lower part by the terrain and in its upper part by a horizontal plane. Once the mesh is constructed, an adaptive local refinement of tetrahedra is used in order to capture the plume rise. Wind measurements are used to compute an interpolated wind field, that is modified by using a mass-consistent model and perturbing its vertical component to introduce the plume rise effect. Then, we use an Eulerian convection–diffusion–reaction model to simulate the pollutant dispersion. In this work, the transport of pollutants is considered and dry deposition is formulated as a boundary condition. The discretization of the stack geometry allows to define the emissions as boundary conditions. The proposed model uses an adaptive finite element space discretization, a Crank-Nicolson time scheme, and a splitting operator. This approach has been applied in La Palma island. Finally, numerical results and conclusions are presented.2015-02-12T13:18:48ZA multimesh adaptive scheme for air quality modeling with the finite element methodhttp://hdl.handle.net/2117/26313
Title: A multimesh adaptive scheme for air quality modeling with the finite element method
Authors: Monforte, Lluis; Pérez Foguet, Agustí
Abstract: A multimesh adaptive scheme for convection–diffusion–reaction problems for a large number of components
is presented. The problem is solved by splitting transport and reaction processes. This way, the evaluation
of the nonreactive part for each component and the reaction at each node constitute independent tasks. This
allows to discretize each component of the solution on a distinct computational mesh, adapted on the basis
of its error indicator. The standard single-mesh strategy is used for comparison. Simulations of a point emis-
sion in a 3D domain are presented. Low remeshing periods of the adaptive scheme are found to be optimal,
in terms of computational cost and accuracy, for the nonreactive problem. Examples with several reaction
terms, with an increase of the complexity, are then presented. Results show that the accuracy of single-mesh
and multimesh strategies are similar. Instead, the computational cost of the multimesh strategy is lower than
the single-mesh in the majority of the examples; this process is controlled by the stiff behavior of the reactive
term. The problem size of the multimesh scheme is much lower, and therefore, larger spatial discretizations
can be simulated for a given available memory. The efficiency of the multimesh strategy increases with
the number of species and the number of species that develop a plume. Finally, an example of a punctual
emission considering realistic values of the initial concentrations and using the Community Multiscale Air
Quality-CBO5 reaction model, which involves 62 components, is presented; the small-scale structure of the
different nitrogen components near the emitter is capture2015-02-12T09:26:28ZExperiencia de la escuela de caminos de Santander en la formación sobre ingeniería civil para cooperación al desarrollo¿http://hdl.handle.net/2117/26107
Title: Experiencia de la escuela de caminos de Santander en la formación sobre ingeniería civil para cooperación al desarrollo¿
Authors: Rodríguez González, José Antonio; Pérez Foguet, Agustí
Abstract: La Subdirección para Cooperación al Desarrollo de la Escuela de Caminos de Santander ha potenciado las
actividades formativas en Ingenier
ía Civil para Cooperación al Desarrollo, como respuesta a una demanda
profesional de futuro.
Tomando como base la experiencia de las Escuelas de Caminos de Barcelona y de la Coruña y contando con la
experiencia práctica de ISF, la Escuela de Caminos de Santander, apoyada por las delegaciones de los Colegios
Profesionales de ICCP e ITOP en Cantabria, impartió un primer curso de
Ingeniería para Cooperación al
Desarrollo,
con gran éxito entre los alumnos de los últimos cursos de las titulaciones de Caminos e ITOP.
La motivación e interés de los alumnos ha abierto nuevas
expectativas docentes en la Escuela y un Programa de
Actuación para el curso 2007-2008 en el que se incluyen actividades de grado y postgrado, proyectos y prácticas
fin de carrera y relaciones con Instituciones, Empresas
y ONGs, dirigidas hacia una próxima especialidad de
Ingeniería Civil para Cooperación al Desarrollo.
En el artículo presentado se expone el resumen y conclusiones del Curso realizado y el Programa de Actividades
para grado y postgrado en 2007-2008, así como las re
laciones institucionales creadas y su integración en la
Universidad de Cantabria.2015-01-27T11:46:55ZPromocionando una ingeniería global a través de la movilidad estudiantil: formación de voluntariado y estadías de corta duración en programas de cooperación al desarrollohttp://hdl.handle.net/2117/26104
Title: Promocionando una ingeniería global a través de la movilidad estudiantil: formación de voluntariado y estadías de corta duración en programas de cooperación al desarrollo
Authors: Sneij, J; Boni Aristizabal, Alejandra; Pérez Foguet, Agustí
Abstract: 1
Impreso de Ponencias y Comunicaciones
Área de Estudio: Área 4: EpD y Sensibilización
Naturaleza del trabajo (ponencia o comunicación):
Promocionando una ingeniería global a través de la movilidad estudiantil: formación de
voluntariado y estadías de corta duración
en programas de cooperación al desarrollo.
Resumen
La participación en programas de coope
ración al desarrollo es un instrumento
privilegiado de educación para el desarrollo y,
más en general, en valores como la paz,
la sostenibilidad o la interculturalidad. En
este trabajo se describe el Programa de
Conocimiento de Realidad, impulsado por Ingenier
ía Sin Fronteras dentro de su línea de
educación para el desarrollo, que incorpora
diferentes posibilidades de intercambio y
participación de estudiantes de universidad
en programas de cooperación con una clara
vertiente tecnológica.
Las estancias, por lo general su primera expe
riencia en un país en desarrollo, pretenden
acercar a los participantes a la realidad de
las comunidades desfavorecidas a través de
un trabajo técnico de apoyo a un programa de
cooperación al desarrollo. Entre 1999 y el
2005, se han movilizado 71 estudiantes de la
Universidad Politécnica de Cataluña en
actividades del programa desarrolladas en El
Salvador, Argentina, Camerún y Perú.
Muchos de ellos han mantenido después un
fuerte compromiso en el área de la
cooperación para el desarrollo.2015-01-27T11:38:26ZFormación interdisciplinar de educación para el desarrollo dirigida a docentes de titulaciones científico-técnicas en un entorno virtual de aprendizajehttp://hdl.handle.net/2117/26103
Title: Formación interdisciplinar de educación para el desarrollo dirigida a docentes de titulaciones científico-técnicas en un entorno virtual de aprendizaje
Authors: Pérez Mansilla, Sonia; BONI, A; Pérez Foguet, Agustí
Abstract: Desde 2001, ISF se ha planteado como estrateg
ia prioritaria para la promoción de la
educación para el desarrollo en la universi
dad, la formación del profesorado de carreras
científico-técnicas. El objeti
vo general es la promoción
de la tecnología para el
desarrollo humano en los estudios de i
ngeniería (Pérez-Foguet et al., 2005).
La estrategia planteada se concretó en
el año 2003 con el cu
rso semipresencial
“Educando en Tecnología para el Desarro
llo”, de 84h de duración y en el que
participaron un total de 61 profesores unive
rsitarios (Boni et al., 2004). En el 2004, se
realizó un taller presencial de
12h titulado “La educación en valores en el ámbito de los
estudios técnicos: el reto del Espaci
o Europeo de Educación Superior”.
Tras estas dos experiencias, se ha realiza
do durante el primer semestre del 2005-06, el
curso interuniversitario semipresencial
“La universidad, instru
mento de solidaridad.
La enseñanza-aprendizaje para el desarrollo humano sostenible en los estudios
científico-técnicos”
, de 125 horas de duración (5 ECTS
) y acreditado por los Institutos
de Ciencias de la Educación de las siguien
tes Universidades: UPM, UPV, UAB, UB y
UPC.
En este artículo se analizará esta acción
formativa desde dos perspectivas: valorando su
relación con el nuevo Espacio Europeo de
Educación Superior y considerando las
posibilidades que ofrece una comunidad virtua
l de aprendizaje formada por expertos y
docentes universitarios.2015-01-27T11:36:14ZEducación para el desarrollo y hormigón estructural. Experienciashttp://hdl.handle.net/2117/26101
Title: Educación para el desarrollo y hormigón estructural. Experiencias
Authors: Cladera Bohigas, Antoni; Etxeberria Larrañaga, Miren; Pérez Foguet, Agustí
Abstract: Las universidades españolas han asumido un creciente protagonismo en la
cooperación al desarrollo, poniendo en marcha diferentes actividades encaminadas a
favorecer la solidaridad de todos los sectores de la comunidad universitaria. La
enseñanza del hormigón estructural, una disciplina clave para el desarrollo de nuevas
infraestructuras, no puede ser indiferente. En este artículo se plantean diversas
experiencias que se están llevando a cabo en la red de Ingeniería Sin Fronteras.2015-01-27T11:21:38Z